BTwin 500 Warm Cycling Jacket

The BTwin 500 Warm Cycling Jacket is one of those jersey-cum-jacket styles designed to keep you comfortable during the colder months and on rides of around two hours. Frankly, it delivers in pretty much every respect and is a marked improvement on the otherwise likeable 300 that I tested late last year. However, it's worth trying for size – the medium felt a little snug around the shoulders. 

Just shy of £40 buys a surprisingly high spec: it's made from a polyester/elastane, polyamide and polyurethane mix, though it doesn't feel overly synthetic, and it has stood up to forest fun on my cyclo-cross and mountain bike biased builds. The fabric around the armpits and sides is thinner to encourage decent airflow without feeling draughty on blustery rides, and the thin pile fleece type lining also takes the edge off things.

> Find your nearest Decathlon store here

> Buy this online here

The cut is racing snakes snug, with no room for anything other than a long-sleeve baselayer underneath. There is plenty of length in the arms and back, though, with silicone gripper to prevent creep, especially when hammering along on the drops or tri-bars. The cuffs also create a brilliant wind-cheating seal, even with shorter gloves.

Although a little tighter than I'd prefer around the shoulders, in practice there is sufficient give in the fabric that I never felt constrained – at least on rides around the 2-2.5hr mark, which is precisely what the 500 is designed for.

Compared with the 300 and in temperatures around 3 degrees or so, I've felt just the right side of cool. A longer neck prevents icy blasts from whistling inside, and the thinner side panels prevent rider-generated heat turning clammy yet still block the chill.

This song has remained largely unchanged in milder condition – up to around 8 degrees – as long as you're wearing a decent quality wool or synthetic baselayer. Low rent polyesters did leave me feeling a little damp around the chest, armpits and lower back after two hours of climbing, sprinting and cruising along quiet B roads.

The outer fabric is usefully water repellent in the showery sense; 90 minutes' persistent drizzle and 45 minutes of sleety stuff didn't permeate the top layer, which dries fairly quickly at room temperature. However, I would recommend packing a micro-jacket if conditions look more challenging.

Rather than the standard three pocket terrace at the back, Decathlon has mixed things up a bit. Two deep pockets at the rear will readily accommodate 600-750ml water bottles, bananas, spare tube, multi tool and so on, and there's also an elasticated hip pocket, which some will find ideal for energy bars/other treats and their spent wrappers. I found it surprisingly accommodating of keys, even my jailor's bunch. Unlike with some mesh designs, I never had to worry about stuff being ejected come the first lumpy stretch of tarmac, or creeping out as I rode.

A light clip just beneath the rear pockets is a nice touch, though the pocket tops seem accommodating of most clothing clips.

> Check out our guide to the best winter cycling jackets

Round the front, there's a subtle, medium sized breast pocket for valuables, such as smaller smartphones and money.

Bottom line, I've been pleasantly surprised by the 500's performance in cool, windy conditions. True, it doesn't fare quite so well on longer rides in milder weather and I'd probably throw a 2.5 layer laminate jacket on top when the mercury's dropping towards minus figures. Nontheless, for general winter riding/training runs or middle distance commutes, the 500 Warm is hard to fault. I thought the black and orange colour scheme with smatterings of Scotchlite struck just the right balance, but there are red/charcoal and blue/black alternatives.

Verdict

Good staple with few faults for everyday riding and training